1. Garth Brooks (United States) - Estimated sales: 157 million units
2. George Strait (United States) - Estimated sales: 100 million units
3. Johnny Cash (United States) - Estimated sales: 90 million units
4. Willie Nelson (United States) - Estimated sales: 75 million units
5. Kenny Rogers (United States) - Estimated sales: 65 million units
6. Alabama (United States) - Estimated sales: 60 million units
7. Shania Twain (Canada) - Estimated sales: 51 million units
8. Reba McEntire (United States) - Estimated sales: 41 million units
9. Taylor Swift (United States) - Estimated sales: 36 million units
10. Faith Hill (United States) - Estimated sales: 32 million units